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Phys. Rev. B 77, 064105 (2008) [4 pages]

Pressure effects in the triangular layered cobaltites NaxCoO2

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G. Garbarino
Institut NÉEL, CNRS & Université Joseph Fourier, BP166 Bât E, F-38042 Grenoble Cedex 9, France

M. Monteverde*
Institut NÉEL, CNRS & Université Joseph Fourier, BP166 Bât E, F-38042 Grenoble Cedex 9, France and Laboratorio de Bajas Temperaturas, Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, PAB I, 1428 Buenos Aires, Argentina

M. Núñez-Regueiro
Institut NÉEL, CNRS & Université Joseph Fourier, BP166 Bât E, F-38042 Grenoble Cedex 9, France

C. Acha
Laboratorio de Bajas Temperaturas, Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, PAB I, 1428 Buenos Aires, Argentina

M. L. Foo and R. J. Cava
Department of Chemistry and Materials Institute, Princeton University, New Jersey 08544, USA

Received 16 July 2007; revised 17 December 2007; published 13 February 2008

We have measured transport properties as a function of temperature and pressure up to 30 GPa in the NaxCoO2 system. For the x=0.5 sample, the transition temperature at 53 K increases with pressure, while paradoxically the sample passes from an insulating state to a metallic ground state. Compression on the x=0.75 sample transforms the sample from a metallic state to an insulating state. We discuss our results in terms of interactions between band structure effects and Na+ order.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.064105
DOI:
10.1103/PhysRevB.77.064105
PACS:
61.50.Ks, 72.80.Ga, 62.50.−p

*Present address: Service de Physique de l’Etat Condensé (CNRS URA 2464), DSM/DRECAM/SPEC, CEASaclay, 91191 Gif sur Yvette Cedex, France.

 
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